Component Rework Reliability

Current rework guidelines regarding the number of allowable reworks for a component site are inadequate and need to be upgraded or better understood with solid research.This project proposes to establish a limit for the number of reworks that can occur for components or particular component types on an assembly without impacting the overall reliability. The project will develop new guidelines for reworks to be used in PWA and will write a proposal for new specifications on rework of PWA which will be delivered to standards bodies for their consideration.

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Idea Information

Background:

Most companies say a component can be reworked 2 or 3 times. Maybe only 1 or 2 for a BGA. However there is little or no solid research behind current rework guidelines.

Problem:

What damage and reliability risk occurs from 1, 2, 3 reworks of a single site?

What are the critical design factors that affect damage and reliability at the site of the reworked part?

What damage and/or reliability issues are there for parts that are close to the rework site?

What are the critical design factors that affect reliability of parts that are close to the rework site?

Definition Information

Goals / Benefits:

Establish a limit on the number of reworks that can occur on each component type without impacting the overall reliability.

Develop a guideline for rework to be used in PWA.

Write a proposal for new specifications on rework of PWA.

Approach:

The project will design a test vehicle with components placed at varying distances from a large BGA. The components will be then reworked a number of times, the test vehicles will then be examined to establish evidence of reliability degradation. This data will be tabulated with respect to component type and test vehicle geometry.